US4826897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for reclaiming polyethylene terephalate scrap contaminated with chlorine-containing polymer
Assignee: EIDP Inc
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Filing: 1986-12-30
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Granted: 1989-05-02
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Expires: 2006-12-30
Abstract
Abstract Polyethylene terephthalate scrap material containing on its surface a chlorine-containing polymer such as, for example, polyvinylidene chloride or polyvinyl chloride, can be recovered and reused by melt-blending it with a polymer from a defined class of ethylene copolymers containing an epoxy group, and melt processing the blend in the same manner as virgin polyethylene terephthalate. The recovered and reprocessed polymer material has good physical properties and barrier properties.
Inventors
- 👤 Vinodkumar Mehra
- 👤 Pallatheri M. Subramanian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:42
CPC Classifications
C; C08; C08J; C08J11/00; C08J11/04; C08J11/06; C08L; C08L67/00; C08L67/02; C08J2367/00; C08J2367/02; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
154 words
A polymer blend composition consisting essentially of scrap material of polyethylene terephthalate coated with a chlorine-containing polymer selected from the group consisting of polymers of vinyl chloride and polymers of vinylidene chloride, said scrap material being melt-blended with about 5-25% based on the weight of said scrap material of an ethylene copolymer E/X/Y, where E is the radical formed from ethylene and comprises about 40-99.5 weight percent of the ethylene copolymer; X is the radical formed from ##STR2## where: R 1 is an alkyl group with 1-8 atoms; R 2 is hydrogen, methyl, or ethyl; and X comprises about 0-40 weight percent of the ethylene copolymer; and Y is an epoxy group-containing copolymerizable monomer selected from the class consisting of epoxy esters of copolymerizable unsaturated organic acids, epoxy ethers having a copolymerizable vinyl or allyl group, and monoepoxy-substituted diolefins of 4 to 12 carbon atoms, and comprises about 0.5-20 weight percent the ethylene copolymer.
Claim 2
Dependent Claim
154 words
A polymer blend composition consisting essentially of scrap material of polyethylene terephthalate coated with a chlorine-containing polymer selected from the group consisting of polymers of vinyl chloride and polymers of vinylidene chloride, said scrap material being melt-blended with about 5-25% based on the weight of said scrap material of an ethylene copolymer E/X/Y, where E is the radical formed from ethylene and comprises about 40-99.5 weight percent of the ethylene copolymer; X is the radical formed from ##STR2## where: R 1 is an alkyl group with 1-8 atoms; R 2 is hydrogen, methyl, or ethyl; and X comprises about 0-40 weight percent of the ethylene copolymer; and Y is an epoxy group-containing copolymerizable monomer selected from the class consisting of epoxy esters of copolymerizable unsaturated organic acids, epoxy ethers having a copolymerizable vinyl or allyl group, and monoepoxy-substituted diolefins of 4 to 12 carbon atoms, and comprises about 0.5-20 weight percent the ethylene copolymer.
Claim 3
Dependent Claim
12 words
A composition of claim 1 where R 1 contains 4-6 carbon atoms.
Claim 4
Dependent Claim
12 words
A compsition of claim 2 where R 1 contains 4 carbon atoms
Claim 5
Dependent Claim
19 words
A composition of claim 1 where Y is selected from the class consisting of glycidyl acrylate and glycidyl methacrylate.
Claim 6
Dependent Claim
19 words
A composition of claim 3 where the ethylene copolymer is a copolymer of ethylene, n-butyl acrylate, and glycidyl methacrylate.
Claim 7
Dependent Claim
12 words
A composition of claim 1 where R 2 is hydrogen or methyl.
Claim 8
Dependent Claim
10 words
A composition of claim 6 where R 2 is hydrogen.
Claim 9
Dependent Claim
15 words
A composition of claim 1 where X comprises 15-35 weight percent of the ethylene copolymer.
Claim 10
Dependent Claim
15 words
A composition of claim 8 where X comprises 20-35 weight percent of the ethylene copolymer.
Claim 11
Dependent Claim
9 words
A composition of claim 1 where X is absent.
Claim 12
Dependent Claim
15 words
A composition of claim 1 wherein Y comprises 2-10 weight percent of the ethylene copolymer.
Claim 13
Dependent Claim
15 words
A composition of claim 11 wherein Y comprises 3-8 weight percent of the ethylene copolymer.
Claim 14
Dependent Claim
37 words
A composition of claim 1 containing about 0.05-1%, based on the weight of the scrap material, of an additive selected from the group consisting of calcium carbonate, calcium stearate, other metal stearates, and natural or synthetic hydrotalcite.
Claim 15
Dependent Claim
26 words
A composition of claim 1 where there is also initially present in the blend about 5-25%, based on the total polymer weight, of a toughening polymer.
Claim 16
Dependent Claim
11 words
An article obtained by melt fabricating a composition of claim 1.
Claim 17
Dependent Claim
11 words
An article obtained by melt fabricating a composition of claim 5.
Claim 18
Dependent Claim
12 words
An article of claim 15 which is a container or a film.
Claim 19
Dependent Claim
17 words
An article obtained by melt-fabricating a composition of claim 5, which is a container or a film.
References Cited (Backward Citations)
GB1352088A
Cited
FR2307846A1
Cited
US4032594A
Cited
JPS54144453A
Cited
SU912739A1
Cited
US4460729A
Cited
US4555407A
Cited
US4602046A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |